Neil,
The motor mounts are the same, they didn't change until the rubber bumper
mods. when the engine compartment, firewall and transmission tunnel were
changed along with the radiator surround etc. The cylinder head changed
though, going to a little bit larger intake valve, and the size and shape of
the combustion chamber changed ( I think size, know shape...).
You might want to get a book called "How to power tune MGB 4 cylinder
engines" by Peter Burgess. I has a lot of info. ( and opinions) that may be
useful.
Harlan.
ps. my motor runs fine on 92 octane with 15 degrees of advance at 600 RPM,
but pings under load if I go back to 89 octane or lower.
H.
-----Original Message-----
From: Neil Cotty <neilc@tradesrv.com.au>
To: MG List <mgs@autox.team.net>
Date: Thursday, December 17, 1998 11:02 PM
Subject: 18G* and 18V
>Hi all,
>
>I'm considering buying a 18V motor to put in the GT for racing only. I
think
>I read on a site somewhere that there is something different about these
>engines - installation wise - or is it purely post 74 rubber bumper 18V's
>that are different and not the 71-74 18V's? I can't remember what it was,
>engine mounts??
>
>What I'm trying to say is there anything at all I'd need to do if I went
for
>a 71-74 18V or is it just a straight swap? I'm talking about physical
>installation issues not internal motor differences - ie head, valves,
>pushrods, followers, rods, crank etc most of which I'm aware of.
>
>Cheers & TIA,
>Neil.
>--
>Neil Cotty - Sydney, Australia
>1970 MG B GT / 1959 MG A 1600 Mk1
>
>
|